Lock-stitch sewing-machine.



A. G. CHASE.

LOGK STITCH SEWING MACHINE.

APPLICATION FILED MAY 10, 1909 Patented 0013.28, 1913.

1D SHEETS-SHEET 1.

Patented Oct. 28, 1913.

A G CHASE LOCK STITCH SEWING MAGHINE. APPLICATION FILED n 10, 1909.

A. C. CHASE.

LOCK STITCH SEWING MACHINE.

APPLIUATION FILED MAY 10, 1909.

Patented 0011.28, 1913.

10 SHEETS-SHEET 3.

A. G. GHASE,

LOOK STITCH EBWING MACHINE. ArPmuA'rIoH FILED my 10, mos.

Patented 0Gt,23',-1913.'

'10 sums-51mm: i.

A. d. CHASE.

LUUK STITCH SEWING MACHINE.

v APPLIUATIDK TILED MAY 10, 19U9. 076,95 1. Patented Oct. 28, 1913.

"dw y 3 I 1 A. c. GHA SE. LOOK STITCH SEWING MACHINE. mermowmn FILED in10, 1900. 1 07 ,951 Patented 0t.'28',1913.

A. c. cuss.

LOCK STITCH SEWING IAGHIHE.

APPLIOATIO! FILED MAY 10, 1909. 1,076,951 Patented Oct. 28, 1913.

10 SHEETS-SHEET B.

A. 0. CHASE LOCK STITCH SEWING MACHINE.

APPLICATION FILED MAY 10, 1909.

1,076,951., Patented 0013.28, 1913.

r 10 SHEETSBKBET 9. 9, 1

A. U. CHASE. LOGK STITCH SEWING MACHINE. APPLIGATION FILED MAY 10. 1909.

1 076,951. Patented 0ct,28,1913. z 1o SHEETS-SHEET 1o.

UNIT {T f STATES PATENT ICE- AUGUSTUS c. cranes, or BEVERLY,MASSACHUSETTS, essrsuou 'ro UNITED-SHOE MACHINERY COMPANY, or PATERSQN,NEW JERSEY, a coRPoRATIoNoF NEW JERSEY.

owest,

LOGKSTITOH SEWING-MACHINE.

Specification of Letters Patent;

Patented Oct. as, role;

- Application filed May 10, 1909. Serial No. $5,099.

To all whom z'tmag concern Be it known that I, Acocs'rus C. Cease, acitizen of the United States, residing at Beverly, in thccounty of Essexand State of Massachusetts,have invented ceitz'rin new and usefulImprovements in Lock-Stitch Se ing-lVlach-ines; and I do hereby declarethe following to bc a full, clear, andexact description of theinvention, such as Will enable others skilled in the art to Which itappertains to make, and use the some.

Thepresent invention relates to sewing .machines, and-Tnore particularlyto curved hook, lock stitch sewing machines such as are adapted for use1n the manufacture of boots and shoes. In this type of. machine,

theloop: of thread drawnb f the needle is passed about the lockingthread supply in r forming each stitch, and the thread in this loop musthe drawn back through the. work 1 in setting the stitch. A considerablelength of thread musttherefore repeatedly render back and forth throughthe Work and through the thread handling devices during the sewingoperation, with a resulting tend rency to wear and Weaken the threadbefore it enters theseain. This objectionable rendering of the threadmay be reduced by rcduci ingthersizeof the locking thread supply, so

4 supply therethrough, but such reduction -in the amount of thread inthe locking thread that a smaller loop of needle thread is required forthe passage of the locking thread supply necessitates a more frequentreplen i'shing of such supply.

It is the primary object of the present invention to enable frequentreplenishing of the locking thread. supply Without reducing the capacityof the machine and without inconvenience to the operator, so that theuse of a minimum length ofthread in the locking" thread supply isrendered practicable.

To this end the invention contemplates the provision in a lock stitchsewing machine of mechanism for automatically replenishing the lockingthreadsupply, having a novel -construction andmode of operation.

I lmaccordanccwith one feature oi: the invcntion, the holder whichcarries tlle locking thread supply during the sewing is so mounted thatit may be. moved from sewing position into position to receive a freshsupply or la a, and a thread supp to substitute this Wound bobbin nismis provided for automatically replen ishing the supply of thread inthe'holdei when it is thus moved. Broadlyconsidered, the movement of thethread holderw from sewing position into position to receive thc freshsupply oflocking thread, and'the return of the holder to sewingposition,- may he ell'ected manually or automatically "1t thread holderby automatic mechanism which is thrown into operation by the operator,as with such construction the operationof the thread replenishingmechanism is renis preferred, however, to thus rmove-the dered morecertain and reliable, and requires less attention on the part of theoperator; The construction of the threadsupplying mechanism, or holderfor the locking thread supply, is not material to the invention in itsbroader aspects. It is preferred, however, to carry the locking threadsupply upon a hobhln supported Within the holder, and it is alsopreferred to so construct thethread supplying mechanisnr that it willoperateto automatically Wind a prcdeterrriined length of thread upon anempty bobbin, and

for. an exhausted bobbin'in the holde1z- In order that a minimumsupplyofdccking thread may be used, the hobbinzwiiiding"; mechanism ispreferably so controlled that it will wind upon a bobbin only sufiicientthread to sew a. single shoe, and in'zsuch case the bobbin in the holderis, changed" after the sewing of each shoe is coniple-teda To avoidWaste of thread, the bobbin Winding mechanism is provided'with means formeasurmg the length of thread W0tII1Cl upon the bobbin, and thismeasurlng mechanism in its preferred form is adjustableitor-f:

vary the length of thread-wound upon the bobbin in accordance with thesize of shoe to he sewed.

The various features ofuthe' invention above outlined, as Well ascertain further 3 features of invention which arcyset forth in. i

the claims, will be readily understood from an inspection of theaccoinpanylngdrawings, 1n Wh.ioh-- Figure 1 is an elevation, partly insection, showing the left-hand side of asewing machine embodying theinvention in its pneferred form; Fig; 2 is a similar viewshowingright-hand side of the machine; Fig.

. ward the left, the

i the line 6-6,

3 is a plan view showing the parts-ofjthe front the machine; Fig. 4 isafront;elevaa side elevation looking parts at the right o the at theright ofthe bobbin tion; Fig. 5 is bobbin holder and winding mechanismbeing removed or broken" 6 is a detail sectional' view on Fig. 4,looking toward the right; Fig. 7 is a similar view on line 7-7, Flg. 4;Fig. 8 is a similar view on line 8-8,

away; Fig.

' Fig. 4; Flgs. 9 to 11 show details of the rear elevation o changingmechanism;

. sectional view through mechanism; Fig. 12 1s a the bobbin winding andig.'13 is a longitudinal sectional view on line 13-13, Fig. 12; 14 is adetail plan view of the bobbin winding mechanism; Fig. 15 is a verticalthe axis of the shaft thread measurin shown .atthe bottom. of Fig. 14;Fig. 16 is the parts shown in Fig.

-28 is a sectional view on shown 1n the accompanying drawings embodiedin a lock hand en 16; Figs. 19 and mechanism; Figs-"21 to 26 inclusiveare diagrammatic views showing the mode of operation of the bobbinchanging mechanis Fig. 27 is a front elevation of the bOb L/AIT holderremoved from its carrier; and Fig. line 2828, Fig. 27. features of theinvention are i The various stitch sew ng machine havmg the generalconstruction of the sewing 7 machine shown and described in the patentto French and Meyer, No. 473,870, patented Apr l 26, 1892, to whichreference may be had for aeomplete description of the construction andmode of operation of the parts not spe fifically described herein.

The machine shown in the drawings is provided with a work supportingtable 1,11 Presser foot 2, a curved hook needle 3. awl 4, a looper 5, athread arm 6, and with main and auxiliary takeups 7 and 8, all of whichare constructed and operated as full described'in the patent abovereferred to. The machine is also provided with a holder 9 for thebobbin, on which the supply of locking thread is wound,and with a threadhook 10 for taking the loop of thread drawn b the needle and carrying itover the bobbin holder. The bobbin holder 9 is pro vided with acylindrical recess or opening within which the thread carrying bobbin 11is mounted to rotate. The bobbin is provided with end flanges. and isretained within the recess in the bobbin holdepby'means of a springplate 12 providedjwith grooves forengaging the flanges? of the bobbinsition in the outer end nose of the holder by parts being broken away Y10 back, Theplow'er eIid'i". .0 f the lever carries the hook down intoposiholder is provided with a groove 13 extending inward from the faceof the bobbin holder through which the thread leads from the bobbin tothe work during the sewing 'operation. One side of thegroove 13 isformed by a block 1a which is.carried by the'lowerend of a spring arm15, and is forced yieldinglv toward the op posite side of the groove tofrictionally clamp the thread passing through the groove and apply theproper tension to the thread. The upper end of the bobbin holder isshaped to form a pointed loop receiving nose 16 over :which the loop ofthread drawn by the needle is delivered by thethread hook 10. The bobbinholder is supported in fixed poof a carrier 17, the front end of thecarrier being provided with a retaining frame or cage 18 within whichthe bobbin holder is-loosely supported, so that the loop of threaddelivered over the the thread hook may ass down around the bobbinholder;

The thread hook 10 consists of a curved is mounted in the front end of alever 20. The shaft 19 is provided with spiral grooves or threadsengaging hreads formed in a nut secured in the end of the lever 20, andthe upper end of the shaft is connected by a universal joint 21 to thefront end of a second lever 22. The lever 22 is pivoted at 28 upon thelever-20, and is provided at its rear end with a roll playing within acam slot 24 which is formed in a fixed plate 25. The thread hook lever90 is rocked at proper intervals during the operation of the machine bya cam 26 secured to the cam shaft 27 of the machine", and arranged toengage a roll 28 which is carried by a lever 29. The front end of thelever by a pin and slot connection 30 with the rear end of the threadhook lever 20.

When the curved hook needle'has drawn the loop of thread through thematerial. the front end of the thread hock lever 20 is moved upward.During the firstpart of finger extending rearwardly from the lower endof a shaft which 29 is connected the upward movement of the lever. the

lower end of the thread book 10 engages the loop of thread and carriesit upward. The cam slot 91 is'of such shape that during this first partof the upward movement of the thread hook the lever 22 moves with. thelever 20, while during the latter part of the upward movement of .thelever 20, the nut at the front end of the levermoves up the shaft 19,thus. swinging the thread hook 10. forward so that it delivers the loopof thread over the nose of the bobbin holder. When the lever :20 isreturned to normal position,

the nut at the front end of the le\er first tionto receive the next loopdrawn by the l .w f When-the mechanism 181strest in normal povim-spar,The" loop ofihread deliirerecl over the oose of the bobbin holderposses down over the bobbin holder, the cage or frame '18.

in which the holder is mounted being open {815 its frontfo'r the'pessage or the legs of the loop, and being shaped to allow the looptomadily assidown overthe holder.

1 segmen' V additloizito 'the forming inseminentalities, the moohineillu'streiedis pro; .l l i plelilslimg the supply or phreud in-ehebob,

in holder when .the supply becomes ex-:

videdwith mechanism for eutomaiiealiy reboosted: inpreferredliiorrh'lhis meshe nism includes imeohomsm lor W'Hlll g a" sup.-

ply of threadufo'on an om pty bobbin prepare lbobbin forflflSllTlllfllllfi llf and changing] mechanism is arranged shove the.thread" we totliei sul'isicituiion of e w the bobbin in tneholder. i In1 shown the bobbin winding bundling deiziees of the Sewirxgi mechanism,and the bobbiu,li old.er is move up from its normal:orsewin positioninto-position .t'o' codperutef-w'ith t e bobbin changing, mech-.

an sm when ithe supply of thread in the; bobbin holderlhas becomeexhausted. To enabl'e "the bobbin holder to be thus moved, the

' iurnier l7 for. the bobbin holder is secured :io o rook -sha-ft'fil,and isnormally supported in fixed )osition' upon-asupporting plate-32.liliearoo shaft31 is provldedutone .endl

iv pinion -33'whieh is engaged by a. gealr jshiing'ingmech'unisin'. J r

The-bobbin winding and chang ng mechen'ism is provided with 'a bobbinwmgling spindle Ell) which carries-e. 'full bobbin a:

'eitionA The'bohbin winding spindle is pro- I yids-dot -itsf rorlt endwith a projecting The sle ve {46. is provided with a. lapere denlargement which. ooiipersteswith the; HI

pin driifor-engaging the bore of the bobbin, heelid of the pin beingsplit to form spring fingers for frictionally" holding'the bobbin on 18:pm. The pin is formedon the outer endor e rod 4-2 which extends througha re- I sees/formed in vthe end of the spindle, and is held jininorrna'lposition by a; spring 43 inposed between the bottom of the recess audo-collar formed on the rod. The

'springacts rmhold the collar zigeinst' a,

oplr 4:5 'vs 'h-ieh is screwed into the frontondol the recessin thespindle. The. front end i/lV-Lliefspindle'is also provided with a siesvea l? which' is split longitmlinally es I term u swiesaof spring; jawsfor engaging thefil unge on thewbobbin and seouringdt in' ga recessinthe beiiring 458 by;zi*plate 49.

Mwformed on the lower end of'a l lever"35' the upperend'of which ispivotedat 36; Tliel e\ier is providedfwith a roll 37.

cam groove38 formed in the .oam diumfldflyof the bobbin winding andthespring sections of the sleeve 46 firmly intoengagement with theHouse. of the bob bill when the sleeve 46 is-Within the sleeve 47",esindicated in Fig. 13. The outer end dially projecting flange whichcooperates with the outer end of the sleeved? inelampi-ng ihe end ofthesup'plythread previous Oiithe sleeve 4% is also provided with a ratothe Winding of the bobbin, as will be 5 hereinafter more fullyexplained. The winding-spindle 40 is mounted to rotate and- "slidelongitudinally within a bearing'sleeve -'51,Wllh is secured withinthe-bearing 48, and within the split bearing 52. The ion gitudinalmovements are imported. to the spindle, through a reoiproca-tory slide.53, the

end, of which is connected-by means of a stud- 54 with therear-encloiihe. spindle A washerfiii is inberposed between the endof:the spincllefil and the bearing 56 at the end of the slide 53 in'wliiehthe stud54 turns, 'andthe spindle is? heldagainst longitudinalmovement with relation to the slide 53 by are interposed between-thespring and the bearing 56; The spindle 40 is normally sta- ,tion'a'ry,and is rotated at the proper inter vals and during the proper periodsthrough .3' pulley 59 keyed to the spindle and held a spring 57interposedbetween the head of the stud 54 and a series of washers 58which against longitudinal movement by a sleeve b0 which screwed 011 thehub of the pulley, and is provided with a rib 61 arranged between thebearing 52 and a flunge i 62'onthe end of the sleeve 51. The pulleypulley '69 which is secured to thesleeve 68,

and .-is connectedby a belt 70- Wii-h h pulley 71. The pulley 71 issecured upon a shaft 72 arranged at' tl1e rear of like machine, andprovidedwith a WOI'm wheel 73 which-1s engagged by a, ormi l on adriving shiifl', -75.

The shaft -75 is continuously driven by means of a belt 1 6 passing overthe pulley 77 seeured to the shaft. The "clutch merry I ber 66 isforcedin a direction to engage the, continuously rotating clutch member 67 bya springfilfil surrounding the hub ofthe clutch member 66, The clutch isheld out of engagementagainst the tension-iof the spring ?8 by means ofayoke lever 79, procluteh member 66. The lower endf'oi the yoke lever igiimvided with i], laterally liming s s ug norma ise: l

yidedwilh' erms', onits upper eudfwhich curry rolls engaging a.flBngeQSQon the by the spindle.

e s d y nipositlo'n to retain the clutch member 66 out of engagement(Figs. 7, 14 and 15).

The latch 82 is Operated at the proper time by mechanism to be describedto release the yoke lever 79, and when this occurs the clutch members 66and 67 are engaged, and the winding spindle is rotated to wind thethread upon the bobbin carried until the yoke lever 79 is operated by athread measuring mechanism to be here nafter described to disengagetheclutch 66. When this occurs the rotation of the winding spindleceases, and the latch "82 reengages the lug 81 and retainsthewindingclutch out of engagement.

\Vhen the parts are in normal position the thread 7. leads from'thebobbin on the end of the winding spindle-through a' thread guiding eye83, between the fixed and movable jaws 84 and 85 of athread gripper, is

- wound about the measuring wheel 86 of the end of the gripper lever.

through a tube 87 and about a 583, and the movable 1 thread measuringmechanism, and passes guide roll 88, and through asuitable'tensiondevice to the thread supply. Thethread guiding eye 83 is formed. at theouter end of an arm 89,

which is pivotally supported at 90 upon the front end of a carrier plate91 which is secured to a'rock shaft 92. The fixed jaw 84 of the threadgripper is formed on the end of the arm 89 directly above the thread eyeaw 85 of the gripper is formed on the outer end of a lever which ispivoted to the arm '89 at 93. The gripper jaws are held normally open bymeans of a leaf spring 94 arranged to engage the rear The gripper isclosed at the proper time by means of a pin 95 passing through the pivot90'0f the thread j eye and gripper arm, and provided at its lower endwith a conical head 9.6. When the pin 95'is raised in the mannerhereinafter described, the upper end of the pin acting upon the gripperlever operates the lever to grip the thread between the jaws 84 and 85,and the gripper is locked in closed position by means of a latch block97, the front end holder, as already explained. This cam of which isarranged to pass under a flange ,98 on the in 95 when the pin islraised.The, latch block is forced forward by means of a} a latch 82 which holdsthe lever.

This rotation continues groove is engaged by aroller 100 on the lowerend of a lever 101 which is pivotally mounted upon a shaft 102. Theupper end of the lever 101 is curved over the shaft92,

a link 103 with an arm loe becured to the shaft. The lateral movement a:the thread as indicated in Fig. 7, and is connected by eye and grippersis efiected 'by ineans 'of a camgroove 105 formed in a fixed plate 106,and engaged by a pin 107 secured in arm 89 at the rear ofthe'pivot 90(Figs. 5, 18,19and20), "l i The length of thread wound upon the bobbinis determined by a measuring mechanism operated from the wheel 86 aboutwhich the go thread passes on its way to the bobbin. Thismechanismoperates to disengage the winding clutch 66 after apredetermined length" of thread has been wound upon the bobbin;

and is best illustrated ilrFi gs: 3, 4, 6 to 11, 14 and- 15. .As shownin Fig. 15, the wheel 86 about'which the thread is wrapped 18 mounted toturn freely upon the shaft 65,

and the hub of the wheel is provided with a worm 108 engaging awormwheel 109. .The

worm wheel is mounted upon; a sleeve 110 (Fig. 8), which is in turnmounted in a fixed bearing 111 and surrounds a. fixed stud 112. Theworm, wheel is provided in its rear face with an annular groove 113arranged to receive a segmental clutch block 114 which is secured to asegmental trip plate 115. The s free end oftheclutch block 1 143s slit'to form two spring clamping jaws whi normally spring toward eachother so that the block may slide freely in the annular groove 113(Figs. 10 and 15). The jaws of the clutch block are operated to grip thewalls of the groove 113 and thus connect the trip plate 115 with theworm wheel by a cam 116 arranged between the ends of the jaws,

and formed upon a rock shaft 117 which is mounted in. the trip plate.The rock shaft 117 is operated to spread and release the which projectsradially from the rock shaft and is provided with a laterally projectingpin 119. The trip plate is moupted to turn freely upon the stud 112, and'is provided with a hub upon which a, torsional 15 spring 120 issupported. .One. end of this spring is secured to the trip plate, andthe other end of the spring is secured to a collar 121 which isadjustably secured to the stud 112. The spring tends to turn the tripplate 120 toward the right 111"F1gS. 4 and 10, or in a directionopposite to that in whichthe worm wheel 109 is turned by the rotationofthe measuring wheel 86. The trip plate is'pro-L vided with a laterallyprojecting pin 122 air-""125 ranged to engage the end of the yoke lever79, and to operate the lever to'disengage the winding clutch 66. l

The parts of the thread measuring mechanism are normally in thepositions indicated the 7 aws of the clutch block through'an arm 118 110l l l mediately acts to shitt the clutch block end and with the arm 137does not rock the'shaft 102 twee the drawings. Just before the latchSit-isopereted to releasethe yoke lever 7 9 and, en- ;gage the-winding:clutch, an arm 123 which is secured upon the rcicklsheftlOQ-i raised, sothat an inclined cam surface 124 on the end of the arm acts upon the pin119 to rock the shaft 117 and thus release the clutch bloeicfromclamping engagement with the Walls of the groove113 in the Worm wheei109. X hen this occurs the spring 1.20amtrip plete llfi toward Jtherightin Fig. 10, and this movement oi vthe clutch block and trip platecontinnesnntil the arm 118'strikes a stop 125. The engagement of the arm118 with the stop 125 rocks the arm 118 and rock shaft 117,320 that thecam il ti'forees the jaws of the clutch block into clamping engagementwith the Walls of the groove 113. Shortly after the clutch block andtrip plate tireshifted, a, second $1111 126 (Fig; 7) which is secured tothe rock shaft 102 is raised,,a,nd engages a, pin 127 on the latch 82,operating said latch to release the yoke lever 7 9, so that the winding"clutch is engaged. The Winding spindle vis now op-.

eratcd to .Wind thethresd upon the bobbin carried by the spindle, and asthe'wheel 88 is rotated 15 the'thrend, the Worm Wheel 118 and theconnectedclutch-block and trip plate are advanced or moved toward theleftin Fig. 10. This movement continues until the pin 122 engages theyoke lever 79;

and V operates the lever to disengage, the winding clutch. The rockshaft-.102 is op crated at the properv intervcls'and to the properextent through two ELI'IHS 136' and 13-7 which are secured tothe shaftand are arranged to be engaged. by two pins 138 and 139 carried by thece ndrnm 39 (Figs. 1 The engagement of the pin 139 sufficiently to bringthe arm 126 intoengage ment with the pin 127 of the latch 82, While theengagement of the'pin 138 ith-the arm 136 rocks the shaft sofiicientlyto cause the arm 126 to operate the latch 82'. i

In the construction shown the bobbin winding mechanism is constructed towind the proper length of thre-ad'npon the bobbin to sewsu singleshoe.In orderto avoids Waste 10f thread, means are provided for varying thelength of thread Wound by the w nding mechanism, in accordance w th thesize of the shoe' zto be sewed. In the'eon-i VSi-IUQHOII shown, the-fl1I-Ji31013. in the lengthof the thread; according to thesize of theshoe tejhesewed, is secured by adjustmentof theston v lil'fig theposition of Which-det'erininespthe distance through which the .tripplete movesdnringthe winding of the t.-l11iee,d npon, the bobbin andconsequently Ede s ineneeesinqm on Queen, In

hemeasnring Wheel '86 before the end of the thread, eonsistof a, jaw 149cerrying ecnttei blade 150; and p ati g new e s i pet Jim 1 1 a i es thelength of threed which passes the construction. shown, the step 125 isformed on the end of an 2111x1128 extending radially from the inner endof the sleeve 110, and an adjusting. n-rm 129is secured 11513011theouter end of the sleeve. The a'rm 129 is providedwith a springpressed 10cking pin 130,.the inner end of which is arranged to engageany one of a series of holes 131 formed in a disk 132 which issecured tothe front face of the bearing 111. A disk 133 .is formed on the 1311129,and is 1 provided with a line on pointer 134zwhichcoiiperntes with ascale 135 onvthe disk .132 in indicating the proper iadjustment for thevarious sizes of shoesito. be I The bobbin chenging' mechenismjcomprisesmeans for transferringthe -bobbin upon which the thread has been woundby the bobbin winding mechanism to the bobbin holder, and transferringbotlbin e, so mt" in the holder to the winding spin a fresh, supply ofthread may she-wound upon the empty bobbim :In .efi'ecting thistinnsfer', the bobbin; o carried by the end of the winding spindleisfirst transferred ton bobbin holding whichisiz" ranged in line. withthe; bobbin windifi spindle, and is carried by. an'arm 141 whi projectsforward from .a reciprocetoryslide 1432 (Figs. 12 and13); ,The bobbinrcieiy ing stud 140 is split to ionnispringfingers which'frietioneHyengege the bore bf the bobbin. and. retgiin the bobbin onthe stud;

iteciprocatory movementsgare imparted to" the bobbin windingsgiindk n'nd to 'the bob bin receiving stud- ,in' ehangingthebobbin, by a coingroove formed in. theaperiphery of the cam'fldnoin139,;ind. anrangedfztooperate upon a. roilen l ii' which is secured to the slide 1 12. Theinner end of the slide 1 12is provided 'with a; rack 145 which 'e'irgages a gear segment 1&6. The disk .on which the gear segment 146 isformed is provided-with asecond, or segment "147 of sin allerclierneteij Whi engages nqrack 148 formedon the inner end of the-slide53 toxvhich the Winding spindle is eonnected.

Bythese connections the slides 142 a d 53 are simiiltaiieonsly moved 7in opposite (Ii-- ,reetions to bring the end ofthe- ,im=indi;ngspindle,and, .the bobbin reeeivinggstild. to

ward or away from each other, thevmovoinent imparted to the Windingspindlebeing fone helf that, imparted tothc n5 Ci-Vl'l'l;g-Stl1d.,' Theslide 142' a11so. ,;ir 1 ies the, devices for severing the=bobbin thmnd"front the thread suppiy andf gripping the endlof end of an operatinglever 154:.

- ranged to bear against the rear arm of the front end of the levercontrols the various lever. The grippers are closed by a pin 15? havingone end arranged to engage the 154, and having its other end arranged tobe brought into engagement with the plate 91 which carries the threadeye and gripper heretofore described, during the advance movement of theslide 142.

The device for introducing the thread into the tension slot of thebobbin holder comprises a plate 158 carried by the arm l i-1 andarranged to enter the tension 'slot or the bobbin holder during theadvance of the slide 142. ll thread guiding may also be provided fordirecting the thread into the slot, and when used acts in the nature ofa safety device for insuring the engagement of the thread with the slot.The mode of operation of these devices will be more fully explained inthe description of the general mode of operating of the bobbin windingand changing mechanism.

The cam drum 39 which operates and parts of the bobbin winding andchanging mechanism, is driven at the desired intervals through aclutchwhich is thrown into operation at the will. of the operator, and whichdrives the cam drum through a. single revolution, and is thenautomatically thrown out of action. In the construction shown, thisclutch comprises a spring pressed pawl 1G0 pivotally arranged to engagea series of ratchet teeth 161 formed on a sleeve 162 (Figs, 1, 6 and13). The ratchet sleeve 162 is continuously driven from a pulley 6S} 3through a gear 163 formed on. the hub of the pulley, andengaging anintermediate gear 1 164 which engages a gear 165 secured to the ratchetsleeve, The pawl 1G0 held out of engagcn'icnt against the tension ofspring 1% by a trip lever 167, the lower end of which is arranged toengage the tail of the pawl and 3 The trip hold it against a stop pin168. lever is pivotally supported at 169, and the upper end of the leverengaged by a spring 176 end of the lever in the path of the pawl 55 160.The trip lever is operated to release finger 159 L of the drum 39, and

p which is mount- I ed to turn freely about the bearing sleeve isnormally with the ratchet which renders hold the lower i l fordetermining the posit-ion of the-sewing l mechanism when the bobbinmechanism isso that it will engage the ratchet teeth 161 by a trip dog171 l lever 1172. The trip dog is normally held in l position to engagethe upper end of the trip l lever by a spring 173 which holds the upperend of the trip dog against, a stop pin 174. l he lever 172 projectsforward and is prol vided with a handle 17 5, so that it. may be iconveniently operated by the-operator. The 1 lever may also beconnected, as indicated in Fig. 1, with a slide 176 which is connected.i through i shown). When the lever 172 is operated, 1 either through thehandle 175, or through the treadle connected with the slide 17 6, the ldog 171 strikes the upper end of the trip lever 167, rocking the leverso that it releases the pawl 160 and allows the pawl to l engage theratchet teeth 161 The cam l drum 39 is now rotated in the direction ofthe arrow, Fig. 6., After the dog 171 has operated the trip lever,continued movement of the lever 172 causes the dog to disengagethe upperend of the trip lever, so that the lever is returned into the pathof thepawl 1.60. hen the drum has made a complete revolution, strikes the endof the lever, thus disengaging the pawl and arresting the rotation ofthe drum,

In order the clutch pawl 160, after the cam drum has made a singlerevolution, a safety device is provided for disengaging the trip dog 171from the upper end of the trip lever. and returning the trip lever tonormal position in case the lever 172- has not been returned to normalposition, and the dog 171 has failed to disengage the upper end of thetrip lever. This safety device comprises a lever 178 mounted on' thepivot 169, and provided at its upper end with a pin 17 9 for engagingthe latch dog 171. The lower end of this le er is arranged to be engagedby the pin 139. As the cam drum 39rotates, the pin 139 strikes the lowerend of the le ver 178, rocking the lever so that the pin 179 willoperate to lift the latch dog 171 and disengage it from the upper end ofthe trip lever 167. This will insure the return of the latch lever 167to normal position,

i even it the operator has not released the le- 1 ver 172, or has notmoved the lever sufliciently to disengage the dog.

; When the bobbin mechanism is thrown forming instruinentalities shouldbe in such position that they will not interfere with the movement ofthe bobbin holder. In I order that the bobbin changing mechanism i maynot inadvertently be thrown into opl eration when the sewinginstrumentalities means is provided.

are not in proper position,

a rod 177 with a trealdle- (not the tail of thev pawl j 'ito operationby the operator, the stitch antenna.

the sewing mechanism is in proper position for the operation of thebobbin changing mechanism. l/Vhen this recess is in register with thearm on the clutch operating lever, the lever 172 may be shifted to throwthe bobbin changing mechanism into operation, the arm 182 entering therecess as the lever is operated. If the recess 180 is not in reg-- isterwith the arm 182, the arm will strike the periphery of the cam 181, incase it is attempted to operate the clutch controlling lever 172,-andwill prevent a movement of the lever sufi'icient to throw the bobbinchanging mechanism into operation. The

recess 180 is so ,locatcd upon the cam 181 that the sewing mechanismisin proper position for the operation of the bobbin changing mechanismwhen this recess is in regis- Sid ' single revolution and then stops.

the first partof the revolution of the cam ter with the arm 182.

The'operation of the mechanism is as follows, After-a shoe has beensewed, the

machine is brought to rest with the stitch forming mechanism in properpositionv for the removal of the work and for the introduction ofanother shoe into position to be operated upon by the sewing mechanism.At this time the recess 180 in the cam 181 is in position to allow thebobbin changing mechanism to be thrown into action. The operator nowthrows the driving clutch into operation by moving the clutch actuatinglever 172'either by means of the handle 175, or by depressing thetrcadle connected with the lever. The cam drum 39 now makes :1 Duringthe slides 52 and 1&2 are operated to move the bbbbinwinding spindle 40and the bobbin ,receivingstud 1 toward each other. During this movementof the n-"indingspindle the conical projection 50 on the sleeve 46 atthe end of the spindle is disengaged from the sleeve 417, so that thespring jaws which grip the flange of the bobbin a spring outward andrelease the bobbin. The combined movementof the bobbin winding spindleand bobbin receiving stud carries the bobbin on to the bobbin receivingstud, the bobbin holding pin 41 in the end of .the bobbin windingspindle yielding to allow the bobbin holding stud 1&0 to enter the'boreof the bobbin. The bobbin'a is thus transferred to the bobbin holdingstud, as indicated in Fig. 22. During this advance move ment ofthe'slide 142, the gripper jaws 14.9 and 151 have passed on oppositesides of the thread t between the thread guiding eye '83 and the bobbin.During this forward movement of the slide 142,'a. finger 183 secured tothe slide 142 strikes the rear end of the bell crank lever 155 andswings the end of the lever out of the path of the gripper opening leverso that the rear end of the lever 1334 passes in front of the arm of thelever 155. is the slides 52 and 142 complete their advancing movements,the pin 157 strikes the plate $.11 and is operated to close the gripperjaws 149 and 151. lVhen the gripper is thus closed, the thread issevered. by the knife 150 a short distance below the thread guiding eye83, and the end of the bobbin thread is gripped by the jaws 149 and 151.As the slides complete their forward movement, a plate 18-1 on the arm lll rides under the conical lower end 96 of the pin 95, raising the pinto operatethe gripper 85, so that the supply thread. s gripped betweenthe jaws 84 and 85 immediately above the thread guiding eye 83, thelatch slide 97 moving forward under the flange 98 on the pin 95 to lockthe jaw 85 in closed posit-ion.

During the continued rotation of the cam drum 39, the slides 53 and 1 12are returned to their normal position, the bobbin a remaining on thebobbin carrying stud as indicated in Fig. The cam slot 38 now operatesthe lever to swing the carrier for i the bobbin holder up into positionto bring the recess in the bobbin. holder in line with the bobbin (1,the nose of the bobbin holder engaging a gage plate 185 on the slide142.-

This position of the parts is indicated in Fig. "he slides 58 and 14-2are now again. advanced as indicated in Fig. 25. The advance movement ofthe slides at this time is su'liicient to carry the full bobbin a whichis on the bobbin carrying stud 140 into the bobbin holding recess of thebobbin holder. As the bobbin a is carried forward into the bobbinholder, it pushes the empty bobbin 5 i on to the bobbin holding pin .41of the bobbin winding spindle, the spring which backs up the pin bcinsuliiciently slid to holdthe pin. against the friction of the bobbin asit 1s forced on to the spring lingers at the end of the pin. During thisadvance movement of the slide 1 12, the thread which extends from thethread gripping jaws to the bobbin is engaged by the front end of theplate 158, and is pressed into the tension slot 13 of the bobbin holder,as indicated in Fig. 25.

The finger 135) is arranged to engage the thread. bot een the bobbin andthe gripping jaws as the bobbin enters the bobbin holder, and actsto'insure the entrai'lce of the thread into the tension slot. he theslide 142 complates its forward movement, the rear end. of the gripperopening lever 15 1 strikes the arm of the bell crank lever 155, thusopening the grippers to release the end of the bobbin thread. Theadvance movement of the slide is not sufficient at this time to bringthe finger 183 against. the rear arm of the bell crank lever, or tooperate the gripper clos- 53 and 142 new ing pin 157. The slides normalposition.

start to return to their During the retraction of the slides, the plate1 5 91 carrying the thread guiding eye 83, and

gripping jaws 84 and 85,is swung downward as indicated in Fig. 20, tocarry the end of the supply thread between the flange on the sleeve-46and the end of the sleeve at.

During I the downward movement of the thread eye and gripper the arm 89is swung laterally, as indicated in Fig. 19, to bring the thread intoposition to be gripped between the flange on the sleeve 46 and the endof the sleeve 47. As the slides 53, and 1&2 complete their returnmovement, the end of. the supply thread is gripped between the flange onthe sleeve &6 and the end of the sleeve 47, as indicated in Fig. 26, andthe spring s'ections'ot the sleeve 46 are forced inward to firmly gripthe flange of the empty bobin and secure it to the end of the windingspindle. Du-ring this return movement of the slides the grooves in theisforced back to release the gripping jaw 85 by a pin 185 which projectslaterally from. an arm 186 secured to the rock shaft 102, and isarrange'd toengage alug 187 on the side of the latch block. The plate 91is 0 then swung upward to return the thread guiding eye 83 to normalposition, the cam slot 105 acting onthe pin 10'? to swing the threadeyelaterally into line with thece ten-of the empty bobbin; The movement otthe rock shaft 102, which brings the pin 185 into'engagement with thelug 187 on the latch block 97 and releases the'gripping aw 85,preparatory to the return of the thread guiding eye 83 to normalposition, raises the arm 123 to release the clutch block 114:,

' of the-thread measuring mechanism, so that t the said block and theclutch tripping plate 115 are moved into position against the stop 125preparatory tothe-winding of the thread 5 upon the empty bobbin.Immediately thereafter the shaft 102 isrocked-to a greater extent tooperate the latch 82 and'release thev yoke lever' for. the windingclutch 66, so that the winding clutch is engaged, and the o bobbinwinding spindle is rotated to wind the proper l h ,of thread upon thebobbfinQ. When the proper length of thread has been, wound upon thebobbin, the bobbin win thrown out of action in s: the already described.The parts are now in their normal position, ready to be thrown intooperation by the operator when the bobbins are to be again changed.

The mechanism for automatically replenishing the supply of lockingthread in the locking thread holder enables thelocking thread supply tobe replenishedafter the sewing of each shoe is finished, withoutinvolving any in"- terial reduction in the capacity of the machine,since the operator may throw the bobbin winding and changing mechanisminto operation as he is removing a shoe from the machine, and, thechanging of the bobbins and the returnof the bobbin holder toisewingposition, will be eflected. during the interval while he is introducinganother shoe into position to be sewed. The winding of the supply ofthread upon the empty bobbin may be completed during the sewingof thisshoe.

While it is preferred to employ the specific construction andarrangement of parts shown and described, since this construction andarrangement is well adapted forapplication to the machine illustrated inthe-"patent above referred to, it will be understood that thisconstruction and arrangement is not essential except as defined in theclaims. and may be varied and modified as :Eounddesirable and inaccordance with the construction and arrangement of the parts of thesewing machn'ef in which the invention is to be'embodied, c

Having set forth the nature and object of the invention,and-specifically described one form of machine in which it maybeembodied,'what Iclaini is '1. A lock stit h sewing machine, having, incombination, stitch forming devices-ineluding a" holder for the. lockingthread supply, a carrier for the holder stationary during the sewing.and mounted for movement to carry'the holder from sewing position intoposition-to cooperate with a thread supplying mechanism, and a threadsupplying mechanism thread the holder, substantially as described,

23. A. look stitch sewing machine, having, in combination, stitchforming devices including a holder for the locking thread supply, athread supplying mechanism, mechani'sm acting automatically to move theholder for replenishing the supply of from sewing position into positionto coop changing mecl'ianism, substantially as described. y

4. A lock stitch sewing machine, having, in combination, stitch formingdevices including a bobbin holder for the-locking thread. supply, abobbin changing mechanism, mechanism acting automatically to move thebobbin holder from sewing position into position to cooperate with thebobbin changing mechanisi'n and to return it to sewing position, andmechanism for actuating the bobbin changing mechanism to substitute afull bobbin for an empty bobbin in the holder, substantially asdescribed.

A lock stitch sewing machine, having, in combination, stitch formingdevices including a bobbin holder for the locking thread supply, abobbin Winding and changing mechanism, mechanism for moving the bobbinholder from sewing position into position to cooperate with the bobbinchanging mechanism, and mechanism for actuating thebobbin winding andchanging mechanism to transfer the empt bobbin in the holder to thebobbin wine ing mechanism and introduce a full bobbin into the holder,andfor actuating the bobbin winding meoh-- anism to wind a supply ofthread upon the empty bobbin, substantially as described.

6. A. lock stitch sewing machine, having, in combination,-stitch formingdevices i11 eluding a holder for the locking thread supply, mechanismacting automatically under the control of the operator to replenish thesupply of thread in the holder, and means for preventing the operationof the replenishing mechanism when the stitch forming devices are out ofa predetermined relation to each other, substantially as described.

7. A lock stitch sewing machine, having, in combination, stitch formingdevices including a holder for the locking thread sup ply, mechanism forreplenishing the supply of thread in the holder, means under the controlof the operator for throwing the replenishing mechanism into operation,and means for preventing the throwing of the replenishingmechanism intooperation when the stitch forming; devices are out of a pre determinedrelation to each other, substantially is described.

8. A lock stitch sewing machine, having, in combination, stitch formingdevices including a bobbin holder for the locking thread. supplyprovided with a bobbin holding recess extending through from one side tothe other of the holder shaped to allow the bobbin to pass through theholder whereby the bobbin may be introduced at one end of the recessand. discharged through. the other in substituting a full bobbin for anempty bobbin in the holder, substantially as described.

9. A look stitch sewing machine, having, in combination, stitch formingdevices inl l l l l a l l l1 l g l l l l l A the provided with deviceseluding a bobbin holder for the lockin thread supply provided with abobbin. hol ing recess extending through from one side of the holder tothe other, and mechanism for introducing a bobbin at one end of therecess to replace the bobbin discharged there by through the oppositeend of the recess, substantially as described. a

19. A bobbin winding and changing mechanism for lock stitchfsewingmachines, having, in combination, a bobbin windi mechanism, a bobbinreceiving device, an mech anism for actuating the bobbin windingmechanism and bobbin reoeivin device to wind a supplyof thread upon a'bobbin. and transfer the wound bobbin to the bobbin-receiving device,and to thereafter transfer the wound bobbin from the bobbin receivingdevice to a holder for the locking thread supply, substantially asdescribed. 1

11. A bobbin winding and changing' mechanisin for lock stitch sewingmachines, having, in combination, a bobbin Winding spinfor holding thebobbin thereon, a bobbin receiving stud arranged in line with the bobbinwinding spindle, and means for relatively actuating the spindle and thespindle to the stud, and means for transferring the wound bobbin fromthe stud to a bobbin holder, substantially as described.

12. Abobbin winding; and changing mecli anism for lock stitch. sewingmachines, having, in. combination, a bobbin winding spindle, devices forsecuring a bobbin to the spindle, a bobbin receiving stud arranged inline with the spindle, means for actuating stud to transfer a bobbinfrom p the spindle to Wind 2. supply of thread upon a bobbin within theholder to the winding" spindle, substantially as described.

13. it bobbin. winding and changingmechanism for. lock stitch sewingmachines, having, in combination, abobbin winding spindle, devices forsecuring a bobbin upon the spindle, means to actuatin the spindle towind a, supply of? thread upon the bobbin, devices for severing thethread from the thread supply and removing the bobbin from the spindle,and means, for connecting the end of the thread supply with the spindleand guiding the thread to a bobbin secured to the end of the spindle,substantially as described.

1 loclr stitch. sewing machine, having,

namation, a bobbin holder for the looking thread supply, a bobbinwinding and changing mechanism comprising a winding spindle, devices torsecuring a in co.

bobbin i bin'on said spindle, mechanism for actuating said spindletowind asupply of thread upon the bobbin, devices for severing thethread from the thread supply and remov- 5 ingthe wound bobbin from saidspindle, and means for actuating said devices to introduce the woundbobbin into the, bobbin holderand transfer the empty bobbin from theholder to said winding spindle, substanm tially as described.

, ,15; A look stitch sewing machine, having, "in combination, stitchforming devices'gineluding a bobbin holder for the locking threadsupply,-a bobliin'winding mocha hi nism, mechanism operated by thethread for measuring the length of thread wound upon the bobbin by thebobbin winding mechanism, and] mechanism for transferring a wound.bobbin from the bobbin winding mechanism to the bobbin holder,substantially as'dwcribedv- 16. A look, stitch shoe [sewing machine,

"having, in combination, stitch forming devices including a curvedhock-needle and a bobbin holder for the locking-thread sup- 1), abobbin. winding mechanism, means or operating the winding mechanism towin thread upon the bobbin of a length necessary to attach the sole of asingle shoe r only, and mechanism for introduclng the wound bobbin intothe'bobbin holder, substantially as described. 17. lock stitch shoesewingmachine, having,in combination, stitch forming de- 55 vicesfincluding a bobbin holder for the looking thread supply, bobbin windin.-mecha-- nism" ;having provisi0n for varying t e length of threadwound. upon the bobbin in accordance with the size of the shoe to be 40sewed, and mechanism for transferring a Wound bobbin fromthe bobbinwinding mechanism to the bobbin holder, substantially asv described.

18. A lock stitch sewing machine, having, in combination, stitch formingdevices including a bobbin holder for the locking thread supplyprovidedwit-h a tension slot,

bbm supporting devices provided with a thread gripper for holding thefree end of the so bobbin thread, means for relatively actuating thebobbin holder and the bobbin suporting devices to bring the bobbin intoreg lster Withthe bobbin holding recess of the holder, and the threadleading from the '56 thregii gripper to the bobbin into registerwitlfthe tension slot, and means for relatively actuating the bobbinholder and bobbin supporting devices to introduce the bobbin into theholder and the thread leading from the bobbin to the grippers into thetension slot, substantially as described. 19. A- lock stitch sewingmachine,- having, in combination, stitch forming devices including abobbin holder for the locking thread supply, a bobbin winding spindle-"devices, and mechanism for relativel during the sewing and movable tobring provided with devices for'securing a bobbin thereto, bobbinreceiving devices arranged in line with the bobbin winding spindle,mechanism for relatively actuating the bobbin winding spindle and bobbinreceiving devices to transfer a wound bobbin from the bobbin spindle tothe bobbin receiving devices, mechanism for relatively actuating thebobbin holder and the bobbin winding spindle and receiving devices tobring the bobbin holder into position between the bobbin winding spindleand bobbin receiving actuating the bobbin winding spindle an bobbinreceiving devices to transfer the bobbin on the bobbin receiving devicesto the bobbinholder, and transfer. the replaced bobbin in the bobbinholder to the bobbin wind ing spindle, substantially as'described.

20. A lock stitch sewing-machine, having, in combination, stitch formingdevices ineluding a bobbin holder for the thread supply, bobbin windingdevices an bobbin receiving devices arranged. in line with each other,mechanism tor} actuating the bobbin winding devices to wind'al of threadupon a bobbin, mechanism or' relatively actuating the bobbin windin andreceiving devices to sever the bobbin (1 from the thread. supply andtransfer the wound bobbin to the bobbin receiving devices, andmechanism; 'for relatively actuating thebobbinholderand'bobbinwin andreceiving devices to brin thebobbin holder into position between thebobbin Win i and receiving devices and to introduce the wound bobbininto the holder and'transfer the replaced bobbin from the holder to thewinding devices, substantially as described;

21. A look stitch sewing machine, having, in combination, stitch formingdevices'ineluding a holder having a transverse bobbin holding recess, 'abobbin changing mechanism, and a carrier for the holder stationary theholder into register with the bobbin changing mechanism or into theposition where 1t will cobperate with the other stitch forming devicesduring the sewing operation, substantially as described.

22. A lock stitch sewing machine, having, in combination, stitch formingdevices including a curved hook needle and a bobbin holder, a carrierforthe holder stationary during the sewing and mounted for moveo

